If you're interested in the metaphysical meaning of Opal, it acts as a prism within the aura. The aura is the light body that surrounds your physical being. It brings a full spectrum of light energy into the system, soothing and clearing the emotional body. It enkindles optimism, enthusiasm and creativity.
Natural stone with 14k gold electroplating. They are natural with beautiful imperfections and no two are ever exactly the same or a pair.